Boxer’s Fracture

[Shanta Plansinis]

Typicallythe fracture appears in the transverse plane through the metacarpal neck, with volar angulation of the distal fragment. Spiral fractures, which are less common, can be harder to visualize 2.

The degree of palmar angulation is best assessed on the lateral radiograph, with lines drawn through the medullary canal. Lines may also be drawn along the dorsal cortex to assess palmar angulation 7. When this is not possible the oblique view can be used, however, this results in less accurate measurements that tend to overestimate the degree of angulation 6.

Closed reduction can be achieved by stabilizing the proximal part of the metacarpal dorsally and applying pressure to the head of the metacarpal from the palmar aspect while flexing the proximal phalanx 3. An ulnar nerve block may help 5.

A degree of residual palmar angulation is acceptable. The apex dorsal angulation for neck fractures should not exceed 30-40 degrees 3,4. When the fracture is of the shaft, less deformity is acceptable (less than 20 degrees). If angulation exceeds this, palmar pain and reduction of strength may be present on gripping 3.

No rotational deformity is acceptable as this can lead to significant disability, with the little finger overlapping other digits during flexion 4. Articular step-off in cases with intra-articular extension should be no more than 1-2 mm 4.

Boxer fractures are named after the common mechanism of injury, namely that of throwing a punch. It should be noted that only a poorly thrown punch results in this type of fracture, and such injuries are actually uncommon in professional boxers who are taught to transfer as much power as possible through the second and third metacarpals 2,5. Resultantly, fractures of the fourth and fifth metacarpal neck may also be referred colloquially to as scrapper, bar-room, or street-fighter's fractures ref.

A boxer's fracture is the break of the fifth metacarpal bone of the hand near the knuckle.[4] Occasionally, it is used to refer to fractures of the fourth metacarpal as well.[1] Symptoms include pain and a depressed knuckle.[2]

Classically, it occurs after a person hits an object with a closed fist.[3] The knuckle is then bent towards the palm of the hand.[3] Diagnosis is generally suspected based on symptoms and confirmed with X-rays.[3]

For most fractures with less than 70 degrees of angulation, buddy taping and a tensor bandage resulted in similar outcomes to reduction with splinting.[4] In those with more than 70 degrees of angulation or in which the broken finger is rotated, reduction and splinting may be recommended.[3]

They represent about a fifth of hand fractures.[4] They occur more commonly in males than females.[4] Both short and long term outcomes are generally good.[4] The knuckle, however, typically remains somewhat deformed.[5]

The symptoms are pain and tenderness in the specific location of the hand, which corresponds to the metacarpal bone around the knuckle. When a fracture occurs, there may be a snapping or popping sensation. There will be swelling of the hand along with discoloration or bruising in the affected area. Abrasions or lacerations of the hand are also likely to occur. The respective finger may be misaligned, and movement of that finger may be limited and painful.[citation needed]

Metacarpal fractures are usually caused by the impact of a clenched fist with a hard, immovable object, such as a skull or a wall.[6] When a punch impacts with improper form, the force occurs at an angle towards the palm, creating a dorsal bend in the bone, ultimately causing the fracture when the bone is bent too far.[citation needed]

When a boxer punches with proper form, the knuckles of the second and third metacarpal align linearly with the articulating radius, followed linearly by the humerus. Due to the linear articulation of bones, the force is able to travel freely across these joints and bones and be dissipated without injury. Therefore, fractures of the second or third metacarpals are rare, with fractures of the 4th and 5th metacarpals comprising the vast majority of metacarpal fractures.[7]

Diagnosis by a doctor's examination is the most common, often confirmed by x-rays. X-ray is used to display the fracture and the angulations of the fracture. A CT scan may be done in very rare cases to provide a more detailed picture.[citation needed]

Boxers and other combat athletes routinely use hand wraps and boxing gloves to help stabilize the hand, greatly reducing pain and risk of injury during impact. Proper punching form is the most important factor to prevent this type of fracture.[citation needed]

For most fractures with less than 70 degrees of angulation, buddy taping and a tensor bandage resulted in similar outcomes to reduction with splinting.[4] Conservative treatment with early mobilization has also been found non-inferior when compared to surgical treatment with bouquet pinning for fractures presenting with less than 45 degrees of palmar angulation.[8]

Prognosis for these fractures is generally good, with total healing time not exceeding 12 weeks. The first two weeks will show significantly reduced overall swelling, with improvement in clenching ability showing up first. Ability to extend the fingers in all directions appears to improve more slowly. Hard casts are rarely required, and soft casts or splints can be removed for brief periods of time to allow for cleaning and drying the skin underneath the splint.[11] Pain from injury varies person to person as with most injuries. Depending on the individual a course of over the counter or narcotic pain medication will suffice. Muscle atrophy of 5 to 15 percent may be expected, with a rehabilitation period of approximately 4 months given adequate therapy. In the mildest of cases, full rehabilitation status can be achieved within 3 to 4 months.[citation needed]

Hand and wrist injuries are reported to account for fifteen to twenty percent of emergency room injuries, and metacarpal fractures represent a significant number of those injuries. Hand injuries of this sort are most prevalent among fifteen- to thirty-five-year-old males, and the fifth metacarpal is the one most commonly affected.[12]

Males are nearly fifty percent more likely to sustain fracture from a punch mechanism than females. Male intentional punch injuries are correlated predominantly with social deprivation, while female punch intentional injuries show more correlation with psychiatric disorders.[13] Approximately 3.7 male hand injuries, per 1000, per year, and 1.3 female hand injuries, per 1000, per year, have been reported. Common mechanisms of injury are gender specific. Although the fiscal cost is not available, it can be asserted that the cost is reasonably significant per individual, depending on the cost of emergency care, immobilization, surgery, follow up doctors' visits, etc. in addition to the fiscal impact from loss of and/or limited work abilities.[citation needed]

As these are colloquial terms, texts and medical dictionaries do not universally agree on precise meanings. Various authorities state that a "boxer's fracture" means a break in specifically the second metacarpal bone or third metacarpal bone,[14] with "bar room fracture" being specific to the fourth metacarpal bone or fifth metacarpal bone.[15] This is derived from boxers properly punching through the 2nd and 3rd knuckles, whereas inexperienced fighters often connect with the weaker 4th and 5th. Though some writers assert that boxer's fracture and bar room fracture are distinct terms representing injuries to different bones, this distinction seems to have been lost and most medical professionals now describe any metacarpal fracture as a "boxer's fracture".[citation needed]

This fracture is a stable injury. It's not likely for it to get worse. It's safely treated with the hand in a Velcro brace (Picture 2). The brace will be put on the hand to help keep the bone protected and the wrist and fingers still as the bone heals.

To determine if you have a fracture, your doctor will likely take an x-ray. Treatment varies depending on how far out of place the bone is located. If it is out of place too far, the doctor or provider may offer to push it back into place and cast it or may offer surgery.

Dr. Gregory Minnis is a physical therapist with an interest in orthopedic manual therapy. His work experience includes orthopedic physical therapy, sports medicine, neurological rehab, advanced assessment and treatment of running injuries, and advanced treatment of the pelvic complex, spine, and extremities.

Your treatment may also include surgery if the break is severe enough, if the broken bone protrudes from the skin, or if there are multiple fractures. Surgery is also used for people who use their hands for minute motor skills, such as playing the piano.

Metacarpal fractures are a prevalent concern, comprising 40% of all hand fractures. Particularly affecting an active and youthful demographic are 5th metacarpal fractures, also known as boxer's fractures. These injuries can impair grip strength and dexterity, which are essential for various daily activities and sports. Without proper treatment, boxer's fractures in the young are at risk for malunion or nonunion due to their active lifestyles. Chronic pain, weakness, and hand function limitations may result if the condition is not properly addressed. Nonoperative and operative treatments may be considered, depending on the fracture type and severity.

This activity for healthcare professionals is designed to enhance learners' competence in evaluating and managing 5th metacarpal fractures. Participants in this activity gain in-depth insights into the etiology, presentation, evaluation, and management of these injuries. Treatment strategies are meticulously explored, differentiating between open and closed fractures and considering factors such as angulation, shortening, and rotation. This activity also underscores the interprofessional healthcare team's pivotal role in improving patient outcomes and mitigating the potential economic impact of missed workdays.

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